

I’m not sure if it would work for your situation but you seem to be able to ssh into a server on that network? If so you can run a browser on that computer and tunnel the X session over ssh:
https://www.cyberciti.biz/tips/running-x-window-graphical-application-over-ssh-session.html
Otherwise neko seems neat, I’ve actually been looking for something for watch parties.
Is this just hosted nextcloud with collabora office pre installed?